Use Appcmd.exe change ISAPI and CGI Restrictions

I wanna use Appcmd.exe to change ISAPI andCGI Restrictions settings in IIS, to allow ASP.NET v4.0. And now both ASP.NET v4.0 32bit and 64bit are in the Restrictions list with value 'False', I just wanna amend their value from 'False' to 'True'.

But when I used the command 'appcmd set config /section: isapiCgiRestriction /+"[path='%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll',description=' ASP.NET v4.0.30319 ',allowed='True']"' ,  it said that there was already one unique key path.

So how should I change the value with Appcmd? Thanks a lot.